Prediction method for determining recovery ratio of stratified gas reservoir under different inter-well interference conditions

Abstract

The invention discloses a prediction method for determining the recovery ratio of a stratified gas reservoir under different inter-well interference conditions, and belongs to the technical field of oil and gas field development. Comprising the steps of collecting and sorting gas reservoir basic data; establishing well control areas under different inter-well interferences and a gas reservoir waste gas pressure determination formula based on the existing production pressure difference condition; and finally, determining the layered gas reservoir recovery ratio considering the well control area. According to the method, the accurate gas reservoir discarding condition is determined through the definite integral principle under the maximum production pressure difference, and the problem that the gas reservoir discarding pressure is difficult to solve is solved; the method for determining the gas reservoir recovery ratio is established on the basis of the existing well pattern condition, and the purpose of rapidly and accurately obtaining the gas reservoir recovery ratio is achieved.

Description

Technical Field

[0001] The invention relates to a prediction method for determining recovery rate, in particular to a prediction method for determining recovery rate under different inter-well interference conditions in a layered gas reservoir, and belongs to the technical field of oil and gas field development. Background Art

[0002] The reservoir space of carbonate layered gas reservoirs is complex and has various types. Carbonate layered gas reservoirs are divided into fractured gas reservoirs, fractured pore gas reservoirs and porous gas reservoirs. Among them, fractured pore and porous gas reservoirs account for more than 80% and are an important part of production contribution. However, the control range of different gas wells is different due to the mutual interference between wells, resulting in different combinations. This has caused inevitable technical difficulties in determining the size of the actual well control area and the formation pressure.

[0003] Recovery factor refers to the ratio of the final natural gas produced from a gas reservoir to the original reserves, and is an important indicator for evaluating the development effect of a gas reservoir. Recovery factor evaluation research is also an important task in the development of natural gas reservoirs. At present, the main methods for predicting recovery factor are the empirical method and the material balance method (abandoned pressure method), which are used to evaluate the rationality of the current method and technical conditions and the effect of gas reservoir development. Among them, the empirical method is based on the "Method for Estimating Recoverable Reserves of Natural Gas" (SY / T 6098-2010), and selects the corresponding recovery factor value range, such as Figure 1 As shown; the material balance method uses formula E R =1-(Pa / Za) / (Pi / Zi), where: ER is the recovery factor, in MPa; Pa / Za is the apparent abandonment pressure, Pi / Zi is the original apparent formation pressure, in MPa; Pa / Za is the abandonment pressure condition of the gas reservoir, and the conventional material balance method can only be measured by downhole tools, then the recovery factor E can be calculated. R However, in the prediction process, the recovery rate of the gas reservoir is mainly related to the abandoned pressure of the gas reservoir and the reserves within the well pattern control range of the gas reservoir, that is, there are the following technical problems: 1. The material balance method requires high accuracy of pressure data, with at least two static pressure test points at different times; Second, the material balance method cannot determine the uncontrolled reserves range of gas reservoirs, which is not conducive to expanding the controlled reserves range by supplementary wells in the later stage; 3. The abandoned pressure of gas reservoir in the material balance method is an empirical method, which has certain data errors and cannot guarantee the accuracy of the recovery factor.

[0004] In addition, the prior art CN1464429 is a method for calculating the recovery rate and recoverable reserves of a gas reservoir. The purpose is to consider the dynamic reserve ratio and the difference in gas saturation between the original and abandoned gas reservoirs in the calculation of the recovery rate and recoverable reserves of the gas reservoir, and propose a new method for calculating the recovery rate and recoverable reserves of the gas reservoir - "corrected volumetric method", derive a new calculation formula, and improve the theory of the original method. CN114021821A is a method for predicting the recovery rate of a gas reservoir based on multivariate regression. By simulating the actual reservoir gas extraction method and restoring the formation seepage process, the recovery rate of the gas reservoir is measured. It is suitable for measuring the recovery rate of various gas reservoirs and gas reservoirs in different development methods and different development stages. That is, the above-mentioned prior art does not solve the method for determining the recovery rate of layered gas reservoirs under different well-to-well interference conditions.

[0005] Therefore, it is necessary to improve or optimize the current prediction method of layered gas reservoir recovery rate, accurately evaluate the production and development effect of gas reservoirs, and improve the economic benefits of gas field development. At the same time, it plays an important guiding role in improving the utilization rate of gas reservoir reserves and improving recovery rate. Summary of the invention

[0006] The present invention aims to overcome the shortcomings of the prior art and proposes a prediction method for determining the recovery rate of layered gas reservoirs under different well-to-well interference conditions, which can solve the problem that the material balance method of the prior art requires a large number of pressure measurement points at different periods. In this technical solution, the accurate gas reservoir abandonment conditions are solved by the definite integral principle under the maximum production pressure difference, overcoming the problem that the gas reservoir abandonment pressure is difficult to obtain; and a method for determining the gas reservoir recovery rate is established based on the existing well network conditions, so as to achieve the purpose of quickly and accurately obtaining the gas reservoir recovery rate.

[0007] In order to achieve the above technical objectives, the following technical solutions are proposed: The first objective of the technical solution is to propose a method for predicting the recovery rate of a layered gas reservoir under different well interference conditions, comprising the following steps: S1: Determine the well control area under the existing well pattern conditions based on the basic data of the gas reservoir, and establish the first relationship about the well control area based on the natural gas seepage theory; S2: According to the basic data of the gas reservoir, determine the abandonment pressure of the gas reservoir under the existing production pressure difference condition, and establish the second relationship about the abandonment pressure of the gas reservoir; S3: A third relational expression about the recovery factor is established according to the first relational expression and the second relational expression, and the recovery factor under the existing well pattern conditions and the existing production pressure difference conditions is determined.

[0008] In step S1, a first relational expression about the well control area is established in three cases, including: S11: The control ranges of the two gas wells do not intersect, that is, r 1 +r 2 < d ; That is, the control range of the gas reservoir is the sum of the control areas of the two gas wells. The obtained well control area is shown in the following formula (1): S12: The control ranges of the two gas wells completely overlap, i.e. r 2 - r 1 ≥ d ; That is, the control range of the gas reservoir is the control area of ​​the gas well with the largest radius. S 2 , the obtained well control area is shown in the following formula (2); S13: The control ranges of the two gas wells intersect, that is, r 2 - r 1 < d < r 1 + r 2 ; The control range of gas reservoir cannot be simply S 1 + S 2 This will fall into the misunderstanding of the single well collection method, resulting in an overestimate of the calculated reserves. For this situation, the present invention considers the superposition of pressure fields, that is, solving the area of ​​the boundary figure. The control area is equal to the sum of the areas of the gas wells on the left and right sides. The area of ​​a single gas well can be regarded as two parts symmetrical along the X axis. According to the principle of calculus, the control areas of the two gas wells are: ; The obtained well control area is shown in the following formula (3): In formulas (1), (2) and (3), r 1 、r 2 are the well control radii of the two gas wells, in m; d is the distance between two gas wells, in m; S 1 , S 2 are the controlled areas of the two gas wells, S is the controlled area of ​​the gas reservoir, in m 2 ; x mis any point on the gas reservoir control boundary, in meters.

[0009] In step S2, a second relational expression for the abandoned pressure of the gas reservoir is established in three cases, including: S21: The control ranges of the two gas wells do not intersect, that is, r 1 + r 2 < d ; According to the principle of calculus, the control areas of the two gas wells are sliced ​​into circular slices, and the gas reservoir abandonment pressures of the two gas wells are shown in the following equations (4) and (5) respectively; S22: The control ranges of the two gas wells completely overlap, i.e. r 2 - r 1 ≥ d ; The abandoned pressure of the gas reservoir in the control area is shown in equation (6); S23: The control ranges of the two gas wells intersect, that is, r 2 - r 1 < d < r 1 + r 2 ; The abandoned pressure of the gas reservoir in the control area is shown in equation (7); In formulas (4), (5), (6) and (7), P 1 、P 2 are the gas reservoir abandonment pressures of the two gas wells, P To control the area of ​​gas reservoir abandonment pressure, are the limiting bottom hole flowing pressures of the two gas wells, P e It refers to the original formation pressure of the gas reservoir, and the unit is MPa; is the wellbore radius, R It refers to the radius of the gas reservoir, and the unit is m.

[0010] In step S3, according to the material balance principle, the recovery factor of the gas reservoir is expressed as follows: ; in, is the recovery factor of the integrated gas reservoir, in %; are the abandoned pressure of the packed gas reservoir and the corresponding deviation factor, are the original formation pressure of the gas reservoir and the original natural gas deviation factor, dimensionless.

[0011] In addition, when considering the uncontrolled reserves of the gas reservoir under the existing well pattern conditions, the recovery factor expression of the gas reservoir is improved to: In formula (8), S R is the gas reservoir area, in km 2 , E It is the recovery factor of the controlled part of the gas well, in %.

[0012] The third relationship about the recovery factor is established in three cases, including: S31: The control ranges of the two gas wells do not intersect, that is, r 1 + r 2 < d ; There are two control ranges for the gas reservoir, and the recovery rates of the two gas wells are obtained respectively, and then the area weighting is performed to obtain the recovery rate of the integrated gas reservoir, as shown in the following formula (9); S32: The control ranges of the two gas wells completely overlap, i.e. r 2 - r 1 ≥ d ; The gas reservoir has only one control range, and the gas reservoir recovery factor under current conditions is obtained as shown in the following formula (10); Z3: The control ranges of the two gas wells intersect, that is, r 2 - r 1 < d < r 1 + r 2 ; The gas reservoir is a control range, and the recovery factor of the gas reservoir under the current conditions is obtained as shown in the following formula (11); In formulas (9), (10) and (11), Z is the deviation factor of the integrated gas reservoir, Z 1 , Z 2are the natural gas deviation factors of the two gas wells, dimensionless.

[0013] The second objective of the present technical solution is to provide: a computer-readable storage medium having a computer program stored thereon, and the computer program, when executed by a processor, implements the steps of the above-mentioned perforation optimization cloud computing method based on microservice technology.

[0014] The third objective of the present technical solution is to provide: an information data processing terminal for a perforation optimization cloud computing method based on microservice technology.

[0015] The beneficial technical effects brought about by adopting this technical solution are: 1. The present invention solves the technical problem of the material balance method's requirement for pressure test data points at different periods, and the formation pressure under different well-to-well interference conditions can be determined by the determination method provided in the present invention; 2. The present invention provides three methods for determining the controlled area of ​​gas reservoirs under different well-to-well interference conditions, accurately determining the range of uncontrolled reserves, which can be used to guide the expansion of the reserve control range by supplementary wells in the later stage, which is a major improvement on the material balance method; 3. The present invention solves the accurate gas reservoir abandonment condition by using the definite integral principle under the maximum production pressure difference, thus overcoming the difficulty in obtaining the gas reservoir abandonment pressure; 4. The present invention establishes a prediction method for the recovery rate of layered gas reservoirs by calculating the controlled area and abandoned pressure of gas reservoirs under different interference conditions. The method can be used to predict the recovery rate of well networks with different complexities. The method is more systematic than the traditional gas reservoir material balance method, and the data solution is more scientific and accurate, providing a theoretical basis for quickly and accurately obtaining the recovery rate of gas reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the range of recovery factors of different types of gas reservoirs in the prior art; Figure 2 The present invention is a flowchart of the present invention. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1 When the control ranges of the two gas wells involved in this embodiment do not intersect, that is, r 1 + r2 < d ; Provide a prediction method for determining the recovery factor of layered gas reservoirs under different well interference conditions, such as Figure 2 As shown, specifically including: A. Determine the well control area under the existing well pattern conditions. According to the natural gas seepage theory, establish the first relationship about the well control area. Among them, the control range of the gas reservoir is the sum of the control areas of the two gas wells. The obtained well control area is shown in the following formula; In the formula, r 1 、r 2 are the well control radii of the two gas wells, in m; d is the distance between two gas wells, in m; S 1 , S 2 are the control ranges (i.e., control areas) of the two gas wells, S is the controlled area of ​​the gas reservoir, in m 2 .

[0019] B. Determine the gas reservoir abandonment pressure under the existing production pressure difference condition, and establish the second relational expression about the gas reservoir abandonment pressure; wherein, according to the principle of calculus, the control areas of the two gas wells are processed into circular slices, and the gas reservoir abandonment pressures of the two gas wells are respectively shown as follows; In the formula, P 1 、P 2 are the gas reservoir abandonment pressures of the two gas wells, are the limiting bottom hole flowing pressures of the two gas wells, P e It refers to the original formation pressure of the gas reservoir, and the unit is MPa; is the wellbore radius, R It refers to the radius of the gas reservoir, and the unit is m.

[0020] C. The third relationship about the recovery factor is established based on the first and second relationships to determine the recovery factor under the existing well pattern conditions and the existing production pressure difference conditions; wherein, according to the material balance principle, the recovery factor expression of the gas reservoir is as follows: ; In the formula, is the recovery factor of the integrated gas reservoir, in %; are the abandoned pressure of the packed gas reservoir and the corresponding deviation factor, are the original formation pressure of the gas reservoir and the original natural gas deviation factor, dimensionless.

[0021] Since there are two control ranges in the gas reservoir, the recovery rates of the two gas wells are obtained respectively, and then the area weighting is performed to obtain the recovery rate of the entire gas reservoir, as shown in the following formula; In the formula, are the recovery factors of the two gas wells respectively.

[0022] Example 2 The control ranges of the two gas wells involved in this embodiment completely overlap, that is, r 2 - r 1 ≥ d ; Provide a prediction method for determining the recovery factor of layered gas reservoirs under different well interference conditions, such as Figure 2 As shown, specifically including: A. Determine the well control area under the existing well pattern conditions. According to the natural gas seepage theory, establish the first relationship about the well control area; among them, the control range of the gas reservoir is the control area of ​​the gas well with the larger radius. S 2 , the obtained well control area is shown as follows; r 1 、r 2 are the well control radii of the two gas wells, in m; d is the distance between two gas wells, in m; S 2 is the controlled area of ​​the gas well with a larger radius, S is the control range of the gas reservoir (i.e., the control area), in m 2 ; B. Determine the gas reservoir abandonment pressure under the existing production pressure difference condition, and establish a second relationship about the gas reservoir abandonment pressure; wherein the gas reservoir abandonment pressure of the control area is shown in the following formula; In the formula, P 1 、P 2 are the gas reservoir abandonment pressures of the two gas wells, P is the abandoned pressure of the gas reservoir in the controlled area, in MPa; S 1 is the controlled area of ​​the gas well with the smallest radius, in m 2 ; C. The third relationship about the recovery factor is established based on the first and second relationships to determine the recovery factor under the existing well pattern conditions and the existing production pressure difference conditions; wherein, according to the material balance principle, the recovery factor expression of the gas reservoir is as follows: ; In the formula, is the recovery factor of the integrated gas reservoir, in %; are the abandoned pressure of the packed gas reservoir and the corresponding deviation factor, are the original formation pressure of the gas reservoir and the original natural gas deviation factor, dimensionless.

[0023] Since the gas reservoir has only one control range, the gas reservoir recovery factor under current conditions is obtained as shown in the following formula; In the formula, R It refers to the radius of the gas reservoir, in m; Z is the deviation factor of the packed gas reservoir, dimensionless.

[0024] Example 3 The control ranges of the two gas wells involved in this embodiment intersect, that is, r 2 - r 1 < d < r 1 + r 2 ; Provide a prediction method for determining the recovery factor of layered gas reservoirs under different well interference conditions, such as Figure 2 As shown, specifically including: A. Determine the well control area under the existing well pattern conditions. According to the natural gas seepage theory, establish the first relationship about the well control area. Among them, the control range of the gas reservoir cannot be simply S 1 + S 2 This will fall into the misunderstanding of the single well collection method, resulting in an overestimate of the calculated reserves. For this situation, this embodiment considers the superposition of the pressure field, that is, solving the area of ​​the boundary figure. The control area is equal to the sum of the areas of the gas wells on the left and right sides. The area of ​​a single gas well can be regarded as two parts symmetrical along the X axis. According to the principle of calculus, the control areas of the two gas wells are: ; The obtained well control area is shown as follows; In the formula, r 1 、r 2are the well control radii of the two gas wells, in m; d is the distance between two gas wells, in m; S 1 , S 2 are the controlled areas of the two gas wells, S is the control range of the gas reservoir (i.e., the control area), in m 2 ; x m is any point on the gas reservoir control boundary, in meters.

[0025] B. Determine the gas reservoir abandonment pressure under the existing production pressure difference condition, and establish a second relationship about the gas reservoir abandonment pressure; wherein, the gas reservoir abandonment pressure of the two gas wells is shown in the following formula; In the formula, P 1 、P 2 are the gas reservoir abandonment pressures of the two gas wells, P To control the area of ​​gas reservoir abandonment pressure, The unit is MPa.

[0026] Z. The third relationship about the recovery factor is established based on the first and second relationships to determine the recovery factor under the existing well pattern conditions and the existing production pressure difference conditions; wherein, according to the material balance principle, the recovery factor expression of the gas reservoir is as follows: ; In the formula, is the recovery factor of the integrated gas reservoir, in %; are the abandoned pressure of the packed gas reservoir and the corresponding deviation factor, are the original formation pressure of the gas reservoir and the original natural gas deviation factor, dimensionless.

[0027] Since the gas reservoir is a control range, the recovery factor of the gas reservoir under the current conditions is obtained as shown in the following formula; In the formula, Z is the deviation factor of the packed gas reservoir, dimensionless; R It refers to the radius of the gas reservoir, and the unit is m.

[0028] Example 4 On the basis of Examples 1-3, in this example, when considering that the gas reservoir under the existing well pattern has an uncontrolled reserve range, the recovery factor expression of the gas reservoir is improved to: ; In the formula, SR is the gas reservoir area, in km 2 , E It is the recovery factor of the controlled part of the gas well, in %.

[0029] Example 5 On the basis of Example 1, this example takes two pure gas wells (Well 1 and Well 2) in a gas reservoir in the Sichuan Basin as an example to further illustrate the invention.

[0030] The depth of the gas wells is 5,400 m, the ultimate bottom hole pressure is 6.7 MPa and 8 MPa respectively, the corresponding control range radius is 670 m and 820 m respectively, and the controlled reserves are 569 million cubic meters and 1.709 billion cubic meters respectively; the geological reserves of the block are 4 billion cubic meters, and the area is 9.8 km 2 , the original formation pressure is 59MPa.

[0031] 1. Determine the well control area under the existing well pattern conditions: The total control range of the two gas wells is the sum of the areas of the two gas wells, that is, 3.14 (670 2 +820 2 )=3.52km 2 ; 2. Determine the abandoned pressure of the gas reservoir under the existing production pressure difference: According to the principle of calculus, the control areas of the two gas wells are processed by annular slices, and the abandoned pressures of the gas reservoirs of the two gas wells are obtained to be 10MPa and 12MPa respectively; 3. The recovery rate under the current well network and production pressure difference conditions is obtained: the recovery rates within the control range of the two gas wells are 85.7% and 81.2% respectively, and then, the area is weighted to obtain the recovery rate of the entire gas reservoir of 28.8%.

[0032] Example 6 On the basis of Example 2, this example takes two pure gas wells (Well 3 and Well 4) in a gas reservoir in the Sichuan Basin as an example to further illustrate the present invention.

[0033] The depth of the gas wells is 5400m, the ultimate bottom hole pressure is 7MP and 8.4MPa respectively, the corresponding control range radius is 1020m and 2050m respectively, and the controlled reserves are 1.713 billion cubic meters and 4.309 billion cubic meters respectively; the geological reserves of the block are 8 billion cubic meters, and the area is 23.2km 2 , the original formation pressure is 59MPa.

[0034] 1. Determine the well control area under the existing well pattern conditions: The total control range of the two gas wells is the area of ​​well 4, that is, 3.14×2050 2 =13.19km 2 ; 2. Determine the gas reservoir abandonment pressure under the existing production pressure difference conditions: Considering the superposition effect of the production pressure difference between wells, the gas reservoir abandonment pressure of the two gas wells is 11MPa; 3. Determine the recovery rate under the current well network and production pressure difference conditions: Based on the fact that only one of the two gas wells has a recovery rate of 86.2%, and then, by area weighting, the recovery rate of the entire gas reservoir is 48.3%.

[0035] Example 7 On the basis of Example 3, this example takes two pure gas wells (Well 5 and Well 6) in a gas reservoir in the Sichuan Basin as an example to further illustrate the present invention.

[0036] The depth of the gas wells is 5,400 m, the ultimate bottom hole pressure is 6.6 MPa and 7.4 MPa respectively, the corresponding control range radius is 1,100 m and 1,168 m respectively, and the controlled reserves are 1.832 billion cubic meters and 2.814 billion cubic meters respectively; the geological reserves of the block are 75 billion cubic meters, and the area is 28.3 km 2 , the original formation pressure is 59MPa.

[0037] 1. Determine the well control area under the existing well pattern conditions: The control range is equal to the sum of the areas of the gas wells on the left and right sides. The area of ​​a single gas well can be regarded as two parts symmetrical along the x-axis. According to the principle of calculus, the control area of ​​the two gas wells is 16.08 km 2 ; 2. Determine the gas reservoir abandonment pressure under the existing production pressure difference: Considering the superposition effect and the area weighted principle, the gas reservoir abandonment pressure of the two gas wells is 12.8MPa; 3. Determine the recovery rate under the current well network and production pressure difference conditions: Based on the fact that one of the two gas wells has a recovery rate of 84.8%, then, by weighting the area, the recovery rate of the entire gas reservoir is 47.5%.

Claims

1. A method for predicting the recovery factor of a layered gas reservoir under different well interference conditions, characterized in that: The steps include: S1: Determine the well control area under the existing well pattern conditions based on the basic data of the gas reservoir, and establish the first relationship about the well control area; S2: According to the basic data of the gas reservoir, determine the abandonment pressure of the gas reservoir under the existing production pressure difference condition, and establish the second relationship about the abandonment pressure of the gas reservoir; S3: A third relational expression about the recovery factor is established according to the first relational expression and the second relational expression, and the recovery factor under the existing well pattern conditions and the existing production pressure difference conditions is determined.

2. The method for predicting the recovery factor of a layered gas reservoir under different well interference conditions according to claim 1, characterized in that: In step S1, when establishing the first relational expression about the well control area, it includes relying on the natural gas seepage theory.

3. The method for predicting the recovery factor of a layered gas reservoir under different well interference conditions according to claim 2, characterized in that: In step S1, a first relational expression about the well control area is established in three cases, including: S11: The control ranges of the two gas wells do not intersect, that is, r 1 + r 2 < d The obtained well control area is shown in the following formula (1); S12: The control ranges of the two gas wells completely overlap, i.e. r 2 - r 1 ≥ d The obtained well control area is shown in the following formula (2); S13: The control ranges of the two gas wells intersect, that is, r 2 - r 1 < d < r 1 + r 2 ; The controlled areas of the two gas wells are: ； The obtained well control area is shown in the following formula (3); In formulas (1), (2) and (3), r 1 、r 2 are the well control radii of the two gas wells, in m; d is the distance between two gas wells, in m; S 1 , S 2 are the controlled areas of the two gas wells, S is the controlled area of ​​the gas reservoir, in m 2 ; x m is any point on the gas reservoir control boundary, in meters.

4. The method for predicting the recovery factor of a layered gas reservoir under different well interference conditions according to claim 3, characterized in that: In step S2, a second relational expression for the abandoned pressure of the gas reservoir is established in three cases, including: S21: The control ranges of the two gas wells do not intersect, that is, r 1 + r 2 < d ; The gas reservoir abandonment pressures of the two gas wells are shown in equations (4) and (5) respectively; S22: The control ranges of the two gas wells completely overlap, i.e. r 2 - r 1 ≥ d ; The abandoned pressure of the gas reservoir in the control area is shown in the following formula (6); S23: The control ranges of the two gas wells intersect, that is, r 2 - r 1 < d < r 1 + r 2 ; The abandoned pressure of the gas reservoir in the control area is shown in the following formula (7); In formulas (4), (5), (6) and (7), P 1 、P 2 are the gas reservoir abandonment pressures of the two gas wells, P To control the area of ​​gas reservoir abandonment pressure, are the limiting bottom hole flowing pressures of the two gas wells, P e It refers to the original formation pressure of the gas reservoir, and the unit is MPa; is the wellbore radius, R It refers to the radius of the gas reservoir, and the unit is m.

5. The method for predicting the recovery factor of a layered gas reservoir under different well interference conditions according to claim 4, characterized in that: In step S3, according to the material balance principle, the recovery factor of the gas reservoir is expressed as follows: ； in, is the recovery factor of the integrated gas reservoir, in %; are the abandoned pressure of the packed gas reservoir and the corresponding deviation factor, are the original formation pressure of the gas reservoir and the original natural gas deviation factor, dimensionless.

6. The method for predicting the recovery factor of a layered gas reservoir under different well-to-well interference conditions according to claim 5, characterized in that: In step S3, when the gas reservoir under the existing well pattern condition has an uncontrolled reserve range, the recovery factor of the gas reservoir is expressed as follows: In formula (8), S R is the gas reservoir area, in km 2 , E It is the recovery factor of the controlled part of the gas well, in %.

7. The method for determining the recovery factor of a monolithic gas reservoir taking into account the well control area according to claim 4, characterized in that: The third relational equation for recovery factor is established in three cases, including: S31: The control ranges of the two gas wells do not intersect, that is, r 1 + r 2 < d There are two control ranges for the gas reservoir, and the recovery rates of the two gas wells are obtained respectively. Then, the recovery rate of the integrated gas reservoir is obtained, as shown in the following formula (9); S32: The control ranges of the two gas wells completely overlap, i.e. r 2 - r 1 ≥ d ; The gas reservoir has only one control range, and the recovery factor of the gas reservoir under the current conditions is obtained as shown in the following formula (10); S33: The control ranges of the two gas wells intersect, that is, r 2 - r 1 < d < r 1 + r 2 ; The gas reservoir is a control range, and the recovery factor of the gas reservoir under the current conditions is as shown in the following formula (11); In formulas (9), (10) and (11), Z is the deviation factor of the integrated gas reservoir, Z 1 , Z 2 are the natural gas deviation factors of the two gas wells, dimensionless.

8. A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the method for predicting the recovery factor of a layered gas reservoir under different well-to-well interference conditions as claimed in any one of claims 1 to 7 is implemented.

9. An information data processing terminal according to any one of claims 1 to 7 for predicting the recovery factor of a layered gas reservoir under different well-to-well interference conditions.

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